(Possible paywall? Dunno. I subscribe to The Economist, so it just displays for me.)
Short version: The Bajau people in Indonesia spend 60% of their life underwater. Their neighbors don't. Scientific analysis shows that the Bajau have much larger spleens, which helps increase red blood cells storage which improves oxygenation of the blood, so they can spend longer underwater.
Human evolution, demonstrated on a 1,000 year time scale.
Only a thousand years.
Leif Ericson visits what will become North America. England and Hungary are established. The Song Dynasty begins using gunpowder. The Japanese national anthem is written. Cairo is founded.
I mean... this is freaking RECENT HISTORY, as far as evolution is concerned.
I love science.